my car has 195000 miles. i think its burning a little bit of oil. should i switch from 5w-20 to 10w-40?
the manual says 6 quarts of 5w-20...a '99 (with the original motor) should have 5w30 in it, not 5w20, to start off. from what your saying now , the oil is leaking, not burning & oil weight will not help that, sorry. as to upping the weight, you shoud be ok with 10w30 in your case (ie. high mile's, high temp.). due to the very tight clearance's in these motor's, very heavy oil is a bad idea.
why 5w-30 and not 10w-30 like he posted above? what will the semi-synthetic do? any recommended brands?no all the 4.6s and 5.4s use 5w-20. go with a 5w-30 semi syth.
everyone's gonna have an opinion on something like this, there's not one fit's all answer. the one thing that can't be stessed enough is that synthetic oil (semi or full) will make leaks worse, other than that you'll have to make your own mind up. rthe reason I say 10w30 is that (regardless of anything else) a windsor motor take's 5w30 oil (all of them, if your manual say's diffrent, like I said check the vin# in your owner's manual case & make shure it's the right one & if it is, the 5w20 is a miss print) & 10w30 is a logical step up.hahaha, so one of yall says non-synthetic 10w-30 and the other says semi-synthetic 5w-30... awesome lol